Australia's Race Discrimination Commissioner will challenge Tony Abbott for the first time on Monday over the Prime Minister's push to water down racial vilification laws. Tim Soutphommasane will deliver a speech at ANU on Monday where he will warn the proposed change may ''license racial hatred''. ''It may encourage people to think there is no harm in dealing out racial vilification,'' he will say, according to a copy of the speech obtained by Fairfax Media. Opinion -Read an edited version of the speech, Page 19.